Question

我正在尝试使用群组创建聊天应用程序。我需要这样做，以便用户可以删除组。我做了一切，除了一件事，它起作用了。如果用户删除组而不是创建具有其他名称的组。用户将看到已删除的组名称，而不是新的组名称。用户单击该组后，该名称将更新为新的组名。有谁知道如何解决这个问题？

组删除代码：

func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
    let cell = familyTableview.cellForRow(at: indexPath) as! FamilyTableViewCell
    let familyName = cell.familyName.text!

    guard let uid = FIRAuth.auth()?.currentUser?.uid else {
        return
    }

    let ref = FIRDatabase.database().reference()

    let usersReference = ref.child("Users").child(uid).child("Familys").child(familyName)

    usersReference.removeValue { (removeError, ref) in

        if(removeError != nil){
            print(removeError as Any)
            return
        }
    }

    let familyNamesReference = ref.child("Family Names").child(familyName)

    familyNamesReference.observeSingleEvent(of: .value, with: { (snapshot) in

        if let dictionary = snapshot.value as? [String: AnyObject] {
            let familyUid = dictionary["UID"] as! String

            let familysReference = ref.child("Familys").child(familyUid).child("Users").child(uid)

            familysReference.removeValue(completionBlock: { (removeError, ref) in

                if(removeError != nil){
                    print(removeError as Any)
                    return
                }
            })
        }
    }, withCancel: nil)

    self.familys.remove(at: indexPath.row)
    self.savedNames.removeAll()
    self.savedFunctions.removeAll()
    self.savedImages.removeAll()
    self.namesOtherWay.removeAll()

    DispatchQueue.main.async {
        self.familyTableview.setEditing(false, animated: true)
        self.familyTableview.deleteRows(at: [indexPath], with: .automatic)
        self.familyTableview.reloadData()
    }
}

创建单元代码：

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return familys.count
}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = familyTableview.dequeueReusableCell(withIdentifier: "familyCell") as! FamilyTableViewCell

    if(savedNames[indexPath.row] != nil && savedFunctions[indexPath.row] != nil && savedImages[indexPath.row] != nil){
        cell.familyName.text = savedNames[indexPath.row]
        cell.familyFunction.text = savedFunctions[indexPath.row]
        cell.familyImage.image = savedImages[indexPath.row]

        return cell
    }

    DispatchQueue.global(qos: .userInteractive).async {
        let family = self.familys[indexPath.row]

        cell.familyName.text = family.name
        self.savedNames.updateValue(family.name!, forKey: indexPath.row)
        self.namesOtherWay.updateValue(indexPath.row, forKey: family.name!)
        cell.familyFunction.text = family.function
        self.savedFunctions.updateValue(family.function!, forKey: indexPath.row)

        let imageLink = family.imageLink

        let url = URL(string: imageLink!)
        URLSession.shared.dataTask(with: url!) { (data, response, error) in

            if(error != nil){
                print(error as Any)
                return
            }

            DispatchQueue.main.async {
                if let downloadedImage = UIImage(data: data!) {
                    let image = downloadedImage

                    cell.familyImage.image = image
                    self.savedImages.updateValue(image, forKey: indexPath.row)

                    self.familyTableview.reloadData()
                }
            }
        }.resume()
    }

    return cell
}

我希望有人能够帮助我！感谢。

Answer 1

也许我完全错了，但应该这部分

self.familys.remove(at: indexPath.row)
self.savedNames.removeAll()
self.savedFunctions.removeAll()
self.savedImages.removeAll()
self.namesOtherWay.removeAll()

DispatchQueue.main.async {
    self.familyTableview.setEditing(false, animated: true)
    self.familyTableview.deleteRows(at: [indexPath], with: .automatic)
    self.familyTableview.reloadData()
}

不在这部分内部？

familysReference.removeValue(completionBlock: { (removeError, ref) in

            if(removeError != nil){
                print(removeError as Any)
                return
            }
            // add the part here
        })

因为可以在观察者识别出数据被删除之前重新加载表。

Answer 2

经过几个小时的努力，我终于找到了解决方案！当我删除组（单元格）时，我只需要清除文本区域和uiimages。

表视图中删除的数据将返回

2 个答案: